In order to ensure the safe daily operation of equipment, the welding construction of pipeline construction equipment must be strictly controlled to reduce the probability of problems. However, the power plant will inevitably encounter some problems during operation, and these problems are often caused by operational defects in the welding construction during the installation of pipeline construction equipment. There are also many factors that lead to operational defects in welding construction, such as inadequate installation technology, overtime or insufficient supervision.
Here is the content list:
l Attention and prevention points in welding construction of pipeline construction equipment.
l Factors that cause problems during pipeline construction equipment construction.
l Dealing with welding quality problems of pipeline construction equipment.
Attention and prevention points in welding construction of pipeline construction equipment.
Inadequate operation during welding of pipeline construction equipment will leave hidden dangers to engineering safety. When conducting inspection and acceptance of metal welds, relevant technicians need to be careful, careful, and concentrate on studying and judging, and feedback and solve problems as soon as possible . The existing places where the safety quality does not meet the standards should be immediately compensated to ensure that the unit can continue to operate safely and maintain the original economic costs.
When performing welding operations on pipeline construction equipment, technicians must take professional welding measures. In addition, they must also control the quality of plumbing counterparts. In particular, the quality of joints and arc closing must be strictly controlled by technicians.
Therefore, the weld must not be welded in one layer, but two or more layers must be welded, and the inter-level joints must be staggered by more than 10 mm. In order to be able to deal with the weld bead oxidation site, the internal argon must be in place when the stainless steel pipe is welded. At the same time, technicians must strictly control the temperature between layers, and use water cooling for welding if necessary.
Factors that cause problems during pipeline construction equipment construction.
At the same time, it is necessary to find out which environmental factors will affect the welding work of pipeline construction equipment, especially some special welding methods and welding materials have certain requirements on the environment. For example, alkaline electrodes should be in an environment without water, rust and oil, while argon arc welding should be in an environment without wind, water, rust and oil.
According to the welding conditions of different pipeline construction equipment, corresponding protective measures should be taken to ensure welding. stable quality. The welding of pipeline construction equipment usually involves the connection between the weldment and the counterpart, and the quality of the connection will directly affect the quality of the welding.
In order to clarify their responsibilities, the technicians of pipeline construction equipment must inspect and accept the corresponding weldments before starting welding. For peers with unqualified quality, welding technicians can choose to refuse welding.
Violations of regulations must be dealt with seriously. In addition, during spot welding, due to the unstable welding equipment, corresponding stresses will be generated under normal conditions and defects are likely to occur. It is the weakest place in the entire welded joint. We must let welders with relevant qualifications perform spot welding operations.
Dealing with welding quality problems of pipeline construction equipment.
There are always problems of this kind during pipeline construction equipment construction, leading to continuous occurrence of welding quality problems. Once there is a quality problem, we can start from these aspects: First, we must investigate and analyze the cause of the problem. In addition to investigating the person directly responsible for the problem, we must also find out the related reasons.
For example, the management of the construction site is not in place or scientific, and the management personnel are negligent. They should not be deceived by the surface phenomenon of the problem, but should be investigated in depth. When penalties are carried out after the investigation, in addition to punishing the relevant responsible persons, it is also necessary to formulate rewards for those who find problems in advance.
The welding acceptance of pipeline construction equipment is the main link in the welding construction process to control the quality. During the inspection, different inspection methods and inspection ratios need to be adopted for different types of welds to meet the welding quality control requirements.
After the inspection, it is necessary to accurately feedback the specific situation with the relevant process at the first time, and find the cause of the welding quality problem in time, and give improvement measures and suggestions to ensure that the welding quality reaches the standard. The inspection work is usually easily restricted by the inspection environment and conditions.
Therefore, testing can only be carried out on finished products. Generally, there are two popular testing methods: destructive testing and non-destructive testing. In actual work, non-destructive testing is usually adopted, which is also the most common one. In non-destructive testing, air tightness testing and non-destructive testing are often used.
Finally, make a summary of the problem and propose rectification measures. The content of the measures must be implemented, and the time, progress, and person responsible for the rectification shall be clarified. Otherwise, the effect of the rectification will be poor. In short, in the pipeline construction equipment construction process, strictly implementing the welding process, controlling the quality of the counterpart, and reasonably requiring the construction period should be the main points of pipeline construction equipment control. At the same time, in the pipeline construction equipment process, set up the welding process witness point and do a good job in process monitoring.
During the use of tank welding machine, all arc welding equipment must be maintained at any time and kept in a safe working condition. When the tank welding machine has defects or safety hazards, it must be discontinued until its safety is guaranteed. Repairs must be carried out by approved personnel.
Here is the content list:
l Common problems of tank welding machine.
l What are the correct operating specifications for tank welding machine work?
l Solutions for tank welding machine maintenance and maintenance.
Common problems of tank welding machine.
l Why is the tank welding machine suitable for welding thin plates and drawn arc welding for thick plates?
1. In most cases, tank welding machine is suitable for welding on thin plates, and drawn arc stud welding is suitable for welding on thick plates.
2. Tank welding machine is characterized by high current and short time, so the molten pool is shallow and welding deformation is small.
3. But at this time, the welding strength is still relatively large (welding strength> stud strength> sheet strength, or welding strength> sheet strength> stud strength). Therefore, it is the stud or the sheet that yields first.
4. If tank welding machine is used on a thick plate, the strength of the plate itself is the greatest, because it is almost impossible to be torn, so the stud or welded joint may yield first.
5. Another reason is that tank welding machine cannot be welded on hot-rolled plates, and thick plates are hot-rolled plates in most cases.
6. The drawn arc stud welding current is relatively small, but the welding time is longer, so the molten pool is deeper and the welding deformation is larger.
7. If the deeper molten pool is welded with thin plates, it is easy to cause penetration. Generally, the mminimu plate thickness is required to be 1/4 of the stud diameter.
8. The deeper molten pool makes the welding strength always greater than the strength of the stud itself, so the stud or plate is always the first to yield in the destructive experiment.
l In the stud welder test, how to understand "the welding strength is greater than the strength of the plate and the stud itself"?
1. This sentence is mainly aimed at tank welding machine welding strength test.
2. In the destructive experiment, if the plate is torn or pulled through, and the stud welding part is still not separated from the plate, it means that the stud welding strength is greater than the strength of the plate itself.
3. If the stud is broken or bent and the welded part of the stud is still not separated from the plate, it means that the strength of the stud welding is greater than the strength of the stud itself.
What are the correct operating specifications for tank welding machine work?
l Check the connection
After completing the wiring of the tank welding machine, you must check each installed connector to confirm that it is well connected before starting to operate the equipment. Its contents include:
There must not be any leakage of cooling water, shielding gas or engine oil that affects the safety of welders.
l Work suspension
When the welding work is suspended (for example, during breaks), the output terminal of the equipment or welding machine must be turned off or the power supply must be cut off.
l Mobile welding machine
When you need to move the tank welding machine, you must first cut off the power supply at its input end.
l Equipment not used
The metal electrode and carbon electrode must be removed from the welding tongs when not in use to eliminate the risk of electric shock to personnel or conductive objects. The welding tongs must be placed out of contact with persons, electrical conductors, flammable objects or compressed air bottles when not in use. The welding torch of the tank welding machine must be properly placed when not in use to avoid accidental activation of the gun body switch.
All arc welding equipment must be maintained at any time and kept in a safe worki
Solutions for tank welding machine maintenance and maintenance.
For the tank welding machine construction solution, the following brief description outlines the work process. If the tank welding machine needs repair and maintenance, it can be modified in some details as needed.
Step 1. Place the tank bottom-plate on the prepared foundation and weld it together.
Step 2. Assemble the beam or trellis of the roof, and finally connect it to it.
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The EGW welding used by the tank welding machine is gas-electric vertical welding, which is a gas-shielded arc welding method developed from ordinary gas-shielded gas welding and electroslag welding. The advantages are high productivity and low cost. The main difference with narrow gap welding is that the weld is formed in one pass, rather than multi-pass multi-layer welding.
What is the operation method of tank welding machine?
What are the technical features of tank welding machine?
What is the development trend of tank welding machine?
What is the operation method of tank welding machine?
(1) Left welding method (right→left): small residual height, large width and small splash, which is easy to observe the welding seam, the welding process is stable, the gas shielding effect is good, but the depth of dissolution is shallow.
(2) Right welding method (left→right): The remaining height is large, the width is small, and the splash is large, which is convenient for observing the molten pool and the depth of the molten metal.
(3) Gun delivery method: zigzag swing.
(4) Flat fillet welding does not swing or swing slightly.
(5) The vertical angle is welded upward, and the triangular gun is used.
(6) Welding torch transition: stay on both sides of the molten pool and transition at the front 1/3 of the molten pool.
(7) Gun angle: perpendicular to the weld bead, at an angle of 80-90° along the direction of the gun.
(8) Test plate: the gap is 2.0-2.5mm, and the arc starting point is slightly smaller than the arc ending point. No blunt edge, anti-deformation 1°.
(9) To prevent defects: prevent the angle from melting - burn through the angle. No fusion between layers - pay attention to the gun angle.
The direction of the arc axis of the tank welding machine is perpendicular to the direction of the penetration depth of the weld. During welding, a water-cooled copper slider is used on the front of the weld, and a water-cooled gear row (or pad) is used on the back of the weld. The flux-cored wire is fed into the weldment and in the groove formed by the stopper, the four sides of the molten pool are constrained to realize single-sided welding and double-sided forming at one time. Tank welding machine is a high-efficiency welding technology and equipment.
In recent years, the promotion and application of tank welding machine in engineering has achieved good results, and in-depth research on the fusion welding mechanism of gas-electric vertical welding technology. Tank welding machine has good welding quality, high deposition speed and low comprehensive cost, which provides a broad prospect for the popularization and application of this efficient automatic welding technology and equipment.
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The advantages of hydraulic storage tank lifting equipment are the main ones. With the continuous improvement of design, manufacture and use level, some disadvantages are gradually being overcome. hydraulic storage tank lifting equipment has broad prospects for development.
What are the structural advantages of hydraulic storage tank lifting equipment?
What are the advantages of using hydraulic storage tank lifting equipment?
What are the precautions for installation of hydraulic storage tank lifting equipment?
Since the hydraulic storage tank lifting equipment is connected by oil pipes, the transmission mechanism can be conveniently and flexibly arranged by the connection of oil pipes, which is superior to mechanical transmission. For example, a pump that extracts oil downhole can be driven by a hydraulic drive to overcome the inefficiency of long drive shafts. Due to the large thrust of the hydraulic cylinder and its easy arrangement, it has basically replaced the old-fashioned mechanical transmission in heavy construction machinery such as excavators, which is not only easy to operate, but also beautiful in appearance.
1. The hydraulic storage tank lifting equipment can realize stepless speed regulation in a wide range. With the help of valve or variable pump and variable motor, stepless speed regulation can be achieved, the speed regulation range can reach 1:2000, and the speed can be adjusted during the operation of the hydraulic device.
2. hydraulic storage tank lifting equipment, the thought transmission movement is uniform and stable, and the speed is relatively stable when the load changes. Because of this feature, almost all of the grinder drives in metal cutting machine tools now use hydraulic drives.
3. hydraulic storage tank lifting equipment is easy to achieve overload protection - by means of setting overflow valves, etc., and the hydraulic parts can be self-lubricated, so the service life is long.
4. hydraulic storage tank lifting equipment is easy to realize automation - with the help of various control valves, especially when hydraulic control and electrical control are used in combination, complex automatic work cycles can be easily realized, and remote control can be realized.
The central axis of the hydraulic storage tank lifting equipment should be concentric with the central line of the load force to avoid side force caused by the jacking operation, which may easily cause the seals to wear and the piston to be damaged. For hydraulic jacks for moving objects, keep the oil cylinder parallel to the moving object in the direction of movement during installation, otherwise the cooperation between the hydraulic jack and the moving object will be unreliable.
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